AKIPRESS.COM - Syrian government forces have attacked rebel-held areas with poisonous chlorine gas in recent weeks and months, leaving men, women and children coughing, choking and gasping for breath, according to interviews with more than a dozen activists, medics and residents on the opposition side, The Jakarta Post reported.

Syria flatly denied the allegations, and they have yet to be confirmed by any foreign country or international organization. But if true, they highlight the limitations of the global effort to rid President Bashar Assad's government of its chemical weapons.

Witnesses near Damascus and in a central rebel-held village said that dozens of cases of choking, fainting and other afflictions from inhaling fumes that some said were yellowish and smelled like chlorine cleanser. Some of those interviewed said they believe the gas was responsible for at least two deaths.

They said the fumes came from hand grenades and helicopter-dropped “barrel bombs,” which are crude containers packed with explosives and shrapnel.

Activists have posted videos similar, though on a far smaller scale, to those from last August's chemical weapons attack near Damascus that killed hundreds of people and nearly triggered U.S. airstrikes against Syria. The new footage depicts pale-faced men, women and children coughing and gasping at field hospitals.

The U.N. Security Council called for an investigation. Council members expressed “grave concern” over the allegations, said Nigeria's U.N. Ambassador Joy Ogwu.

It's an accusation that carries high stakes, and the Syrian opposition has an interest in pushing such claims in hopes of spurring the world to take stern action against Assad, who has been locked in a civil war for three years and faces a Sunday deadline for handing over all his chemical weapons for destruction.

Chlorine is a potentially lethal chemical with a multitude of ordinary civilian uses, including laundry bleach and swimming-pool disinfectant. In high concentrations, it can attack the lungs and asphyxiate victims.